package com.itlong.cloud.utils.picture;

import com.google.zxing.LuminanceSource;

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

public final class BufferedImageUtils extends LuminanceSource {
	  
	  private final BufferedImage image;  
	  private final int left;  
	  private final int top;  
	  
	  public BufferedImageUtils(BufferedImage image) {
	    this(image, 0, 0, image.getWidth(), image.getHeight());  
	  }  
	  
	  public BufferedImageUtils(BufferedImage image, int left, int top, int width, int height) {
	    super(width, height);  
	  
	    int sourceWidth = image.getWidth();  
	    int sourceHeight = image.getHeight();  
	    if (left + width > sourceWidth || top + height > sourceHeight) {  
	      throw new IllegalArgumentException("Crop rectangle does not fit within image data.");  
	    }  
	  
	    for (int y = top; y < top + height; y++) {  
	      for (int x = left; x < left + width; x++) {  
	        if ((image.getRGB(x, y) & 0xFF000000) == 0) {  
	          image.setRGB(x, y, 0xFFFFFFFF); // = white  
	        }  
	      }  
	    }  
	  
	    this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);  
	    this.image.getGraphics().drawImage(image, 0, 0, null);  
	    this.left = left;  
	    this.top = top;  
	  }  
	  
	  @Override  
	  public byte[] getRow(int y, byte[] row) {  
	    if (y < 0 || y >= getHeight()) {  
	      throw new IllegalArgumentException("Requested row is outside the image: " + y);  
	    }  
	    int width = getWidth();  
	    if (row == null || row.length < width) {  
	      row = new byte[width];  
	    }  
	    image.getRaster().getDataElements(left, top + y, width, 1, row);  
	    return row;  
	  }  
	  
	  @Override  
	  public byte[] getMatrix() {  
	    int width = getWidth();  
	    int height = getHeight();  
	    int area = width * height;  
	    byte[] matrix = new byte[area];  
	    image.getRaster().getDataElements(left, top, width, height, matrix);  
	    return matrix;  
	  }  
	  
	  @Override  
	  public boolean isCropSupported() {  
	    return true;  
	  }  
	  
	  @Override  
	  public LuminanceSource crop(int left, int top, int width, int height) {  
	    return new BufferedImageUtils(image, this.left + left, this.top + top, width, height);
	  }  
	  
	  @Override  
	  public boolean isRotateSupported() {  
	    return true;  
	  }  
	  
	  @Override  
	  public LuminanceSource rotateCounterClockwise() {  
	  
	      int sourceWidth = image.getWidth();  
	    int sourceHeight = image.getHeight();  
	  
	    AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);  
	  
	    BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);  
	  
	    Graphics2D g = rotatedImage.createGraphics();  
	    g.drawImage(image, transform, null);  
	    g.dispose();  
	  
	    int width = getWidth();  
	    return new BufferedImageUtils(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
	  }  
	  
	}  
